Photooxidation of Chlorophyll b by Quinones Studied by Chemically-Induced Dynamic Nuclear Polarization
Open Access
- 1 January 1973
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 70 (1) , 143-146
- https://doi.org/10.1073/pnas.70.1.143
Abstract
The photooxidation of chlorophyll b by 1,4-benzoquinone and 2,6-dimethyl-1,4-benzoquinone was investigated by the technique of chemically-induced dynamic nuclear polarization. Polarization of the proton magnetic resonance lines of the quinone was detected. A mechanism for the photooxidation was postulated that invokes the reaction of the quinone with the excited singlet state of the chlorophyll to form a radical pair. This mechanism, together with a theoretical model and parameters taken from the literature, yields a theoretical proton magnetic resonance spectrum for the polarized quinone that agrees well with that observed experimentally.Keywords
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